JPS6114884Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a suspension system for a vehicle, and more specifically, a suspension system for a vehicle that has a suspension arm extending in the width direction of the vehicle body and a strut bar extending in the longitudinal direction of the vehicle body, respectively, on both sides in the width direction of the vehicle body. Regarding equipment.

The longitudinal rigidity of the suspension system is uniquely determined by the rigidity of the strut bark suspension installed between the strut bar and the suspension arm or the vehicle body. However, the front and rear rigidity of the suspension system is required to vary depending on the vehicle speed.

In other words, (a) When the vehicle speed is approximately 80 km/h or less, reduce the front and rear stiffness to improve the shock from road joints, etc.

(b) When the vehicle speed is 80 to 130 km/h, the front and rear stiffness should be differentiated between the left and right sides to improve the flutter caused by rotational vibration of the steering wheel.

(c) When the vehicle speed is 130 to 150 km/h, the front and rear rigidity should be lowered to allow for body shake.

(d) When the vehicle speed is approximately 150 km/h or higher, increase the front and rear rigidity of the suspension and steering system to improve high-speed stability.

Therefore, an object of the present invention is to provide a suspension system for a vehicle that can meet the above requirements by making it possible to change the uniquely defined longitudinal stiffness.

According to the suspension system of the present invention, a piston is provided on the strut bar on each side in the width direction of the vehicle body at the connection portion between the strut bar and the suspension arm or the vehicle body, and the piston is provided on the suspension arm or the vehicle body at the connection portion. A movable built-in cylinder is attached. The two cylinders are connected to the accumulator via a directional valve. This directional switching valve communicates between two cylinders and the accumulator, communicates only one cylinder with the accumulator, and disconnects the two cylinders and the accumulator.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

The suspension system of the present invention includes a suspension arm 10 extending in the width direction of the vehicle body and a strut bar 12 extending in the longitudinal direction of the vehicle body, as shown in FIG. It is a Farson type suspension system.

The inner end of the suspension arm 10 is pivotally connected to the vehicle body, and the outer end is fitted with a ring wheel 14 via a knuckle. A shock absorber 16 is disposed inward of the ring wheel 14 to damp vertical vibrations applied to the suspension arm 10. A stabilizer bar 18 is connected to the suspension arm 10 to prevent rolling of the vehicle body.

The strut bar 12 restricts the movement of the suspension arm 10 in the longitudinal direction, and its front end is attached to the vehicle body 20, and its rear end is formed at a connecting portion 22 with the suspension arm 10. The strut bar 12 may also be arranged diagonally. In the present invention, extending in the longitudinal direction of the vehicle body also includes such an oblique case.

As shown in FIG. 2, the strut bar 12 in the connecting portion 22 is integrally provided with a piston 24, and the suspension arm 10 in the connecting portion 22 is provided with a rubber annular bushing 26.
Cylinder 28 is attached via. The piston 24 is movably housed inside the cylinder 28. In the illustrated example, piston 2
The outer circumferential surface 25 of the cylinder 28 is smaller than the inner circumferential surface 29 of the cylinder 28, and a gap 30 is provided between the two. A liquid chamber 3 defined within the cylinder 28 by the piston 24 is inserted through the gap 30.
2 and 34 are in communication with each other.

The strut bar 12 extends outwardly in a sealed manner through a through hole 36 bored in each of the opposite walls 35, 35 of the cylinder 28. A liquid passage 38 is formed in the axial direction of the strut bar 12 from the free end 13 side of the strut bar 12, and opens into one of the liquid chambers 32 defined within the cylinder 28. A tube 40 is connected to the liquid passage 38. This pipe 40 has at least a flexible portion, and is connected to a directional control valve 42, which will be described later.

Two liquid chambers 3 partitioned within the cylinder 28
Stoppers 44 made of rubber are arranged at 2 and 34. This stopper 44 restricts excessive movement of the strut bar 12. When the strut bar 12 is in a neutral state with no displacement,
A suitable gap 46 is provided between the piston 24 and the stopper 44 so that they do not come into contact with each other. As shown in the figure, the stopper 44 is tapered toward the end facing the piston 24. As a result, the stopper 44 against the movement of the piston
resistance gradually increases.

The structure of the connecting portion between the suspension arm 10 and the strut bar 12 is common to suspension systems installed on both sides of the vehicle body in the width direction. Therefore, the two left and right cylinders 28L, 28R
will be provided in the width direction of the vehicle body. As shown in FIG. 3, the liquid chambers of each cylinder 28L, 28R are connected to a directional control valve 42 via a pipe 40, and further to an accumulator 48 having gas spring characteristics.

As shown in FIG. 4, the directional control valve 42 is configured such that a valve body 52 slides within a valve casing 50, and the valve casing 50 has one inlet port 54.
and two outlet ports 55, 56. This inlet port 54 is connected to a tube 58 and communicates with the accumulator 48 . Also outlet ports 55, 56
are connected to the tubes 40, respectively, and the left cylinder 2
8L and right cylinder 28R. The valve body 52
has an inlet port 54 to two outlet ports 5.
5 and 56, a second portion 64 having a passage 63 connecting from the inlet port 54 to one outlet port 55, and a third portion 66 having no passage at all. It is provided.

Now, as shown in FIG. 4, the first portion 62 of the valve body 52 connects the inlet port 54 and the two outlet ports 5.
5, 56, the two cylinders 28L, 28R communicate with the accumulator 48, so that both pistons 24 and thus the strut bar 12 can easily move within the cylinders 28. As a result, front and rear rigidity becomes low. Conversely, when the third portion 66 moves to the position of the first portion 62 shown and blocks the cylinder 28 and the accumulator 48, the piston 24 can hardly move within the cylinder 28, so it cannot move back and forth. Rigidity increases. In this manner, by switching the directional switching valve 52, the longitudinal rigidity can be changed. Therefore, the above-mentioned request can be met by switching to an appropriate position depending on the vehicle speed. Switching in this case may be performed automatically or may be performed artificially. Directional switching valves can be selected as desired, such as electromagnetic type or pilot pressure type.

In the above example, a piston and a cylinder are provided at the connection portion between the suspension arm and the strut bar. Alternatively, the connecting portion between the strut bar and the vehicle body may have the same configuration.

According to the present invention, since the longitudinal stiffness can be changed from a low value to a high value depending on the vehicle speed, it is possible to drive the vehicle with the most preferable characteristics. As a result, the vehicle can be driven with good feeling and driving stability is improved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the suspension system of the present invention, FIG. 2 is a sectional view of the main parts, FIG. 3 is an explanatory diagram showing the outline of the arrangement, and FIG. 4 is a sectional view of the directional control valve. 10: Suspension arm, 12: Strut bar, 22: Connection part, 24: Piston, 28:
Cylinder, 42: Directional switching valve, 44: Stopper,
48: Accumulator.

Claims (1)

[Scope of utility model registration request] A suspension system for a vehicle having a suspension arm extending in the width direction of the vehicle body and a strut bar extending in the longitudinal direction of the vehicle body on both sides in the width direction of the vehicle body, the connection portion between each of the strut bars and each suspension arm or the vehicle body. a piston integrally provided on the strut bar; a cylinder attached to each suspension arm or vehicle body in the connection portion and movably housing the piston; and an accumulator for supplying working fluid to the two cylinders; A directional switching valve interposed between two cylinders and the accumulator, which communicates with the two cylinders and the accumulator, communicates only one cylinder with the accumulator, and shuts off communication between the two cylinders and the accumulator. Vehicle suspension systems, including.